/**
 * Created by yuanzhy on 2019/1/13.
 */
Date.prototype.format = function(fmt='yyyy-MM-dd'){
    var o = {
        "M+": this.getMonth() + 1,                 //月份
        "d+": this.getDate(),                    //日
        "h+": this.getHours(),                   //小时
        "m+": this.getMinutes(),                 //分
        "s+": this.getSeconds(),                 //秒
        "q+": Math.floor((this.getMonth() + 3) / 3), //季度
        "S": this.getMilliseconds()             //毫秒
    };
    if (/(y+)/.test(fmt))
        fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
    for (var k in o)
        if (new RegExp("(" + k + ")").test(fmt))
            fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
    return fmt;
}
Number.prototype.roundToString = function(scale=0) {
    let r
    if (scale) {
        r = this.toFixed(scale)
        while (r.endsWith('0')) {
            r = r.substring(0, r.length - 1)
        }
        if (r.endsWith('.')) {
            r = r.substring(0, r.length - 1)
        }
    } else {
        r = Math.round(this).toString()
    }
    return r;
}
